When the Beatles played Shea Stadium in 1965, they used a 600W amplifier and Altec-Lansing speakers that Bill Hanley and his team put together.
The system was woefully inadequate for an outdoor show in a stadium that seated 55,300 people, but it was likely the best solution available at the time. Live sound reinforcement has come a long way since then; one of the greatest tools for sound designers is software that visualizes sound propagation in three dimensions, showing how sound waves interact with the environment, including walls, ceilings, seats, and people.
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